Measuring individual data of spectacles

ABSTRACT

An apparatus and a method for measuring individual data of spectacles arranged in a measurement position are disclosed. The spectacles have a left and/or a right spectacle lens. The apparatus has a display for displaying a test structure. The apparatus contains an image capture device for capturing the test structure with an imaging beam path which passing through the left spectacle lens and/or the right spectacle lens of the spectacles. Further, the apparatus includes a computer unit with a computer program for determining a refractive power distribution for at least a section of the left spectacle lens and/or the right spectacle lens from the image of the test structure captured by the image capture device and a known spatial orientation of the display relative to the image capture device. To measure individual data of spectacles, the spectacles are arranged in a measurement position.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part application of InternationalApplication No. PCT/EP2016/064764 filed on Jun. 24, 2016 and designatingthe United States, and claims priority to German patent application DE10 2015 211 879.7 filed on Jun. 25, 2015, both of which are herebyincorporated by reference in their entireties.

TECHNICAL FIELD

The disclosure relates to an apparatus for measuring individual data ofspectacles arranged in a measurement position, the spectacles having aleft and/or a right spectacle lens. Furthermore, the disclosure relatesto a method for measuring individual data of spectacles arranged in ameasurement position.

BACKGROUND

An apparatus and a method of the type set forth at the outset are knownfrom US 2007/0121100 A1. Described therein is a measurement apparatusfor measuring spectacles, having a first measurement station in whichthere is an illumination device and a first image capture device with acamera serving to capture the permanent markings on a spectacle lens. Ina further measurement station, arranged at a distance from the firstmeasurement station, the measurement apparatus has a further imagecapture device with a camera serving to measure the refractive power ofspectacle lenses. In the measurement apparatus, spectacles to bemeasured have to be displaced in a referenced manner between themeasurement stations by way of a receptacle mechanism.

DE 1 238 690 B1 describes a lensmeter with a spectacle mount formeasuring the vertex power of spectacle lenses which are held in theframe of spectacles.

U.S. Pat. No. 8,081,840 B2 discloses an apparatus for checking anoptical element that is transparent to light or that reflects light,having an illumination device and a camera. In the apparatus, theoptical element to be tested is arranged between the illumination deviceand the camera. Then, a multiplicity of patterns which run through aphase shift are provided with the aid of the illumination device.Subsequently, an individual image is calculated from the phase-shiftedpatterns, and optical data of the optical element is derived from theindividual image.

U.S. Pat. No. 5,307,141 describes an apparatus for determining therefractive power distribution of spectacle lenses in a pair ofspectacles. However, permanent markings of the spectacle lenses thatdefine a local, body-inherent coordinate system are not captured in thiscase.

WO 95/22748 A1 and U.S. Pat. No. 7,486,389 B2 disclose an apparatus fordetermining the refractive power distribution of spectacle lenses inwhich spectacle lenses are measured without a spectacle frame.

U.S. Pat. No. 5,973,772 A specifies a system for determining therefractive power distribution of spectacle lenses in spectacles, thesystem having a first measurement station for determining the form ofthe frame and containing a further measurement station, arrangedseparately from the first measurement station, serving to determineoptical characteristics of spectacle lenses when these have not yet beenreceived in spectacles.

In order to facilitate in-focus vision for a spectacle wearer, thespectacle lenses must be correctly positioned and aligned in relation tothe eyes of the spectacle wearer in the frame of a pair of spectacles.In principle, the correct alignment and positioning is required in allspectacle lenses. The correct alignment and positioning of the spectaclelens is of particular importance in the case of individualized opticalspectacle lens designs and/or in the case of progressive lenses.Progressive lenses allow spectacle wearers in-focus vision in differentuse situations, e.g., at different distances, by changing the viewingdirection only, without this requiring a relatively large accommodationsuccess of the eyes in the process. Individual lenses and/or progressivelenses have one or more reference points, e.g., a distance referencepoint and a near reference point, the orientation of which, depending onthe use situation, must be adapted to the location of the pupils of theeyes of a spectacle wearer.

In technical terms, the near reference point and the distance referencepoint of progressive lenses are also referred to as near constructionpoint and distance construction point. A definition of these points isprovided in Chapters 5.13 and 5.14 of the EN ISO 13666:1998 standard,the entirety of which is referred to herewith and the content of whichis incorporated into this application.

Ideal vision with progressive lenses presumes that the progressivelenses held in a spectacle frame are positioned in front of the eyes ofthe spectacle wearer in such a way that the orientation of the distancereference point and the orientation of the near reference point conformto the viewing directions of the spectacle wearer when looking into thedistance and when looking up close. Therefore, according to thespecifications in Chapter 7 of the DIN EN ISO 8980-2:2004 standard,progressive spectacle lenses must be provided with at least twopermanent markings. According to the aforementioned standard, these atleast two markings must exist on a progressive spectacle lens with aspacing of 34 mm and must be arranged symmetrically to a vertical planethrough the fitting point or the prism reference point. These twomarkings define a local, body-inherent coordinate system for thespectacle lens. These markings can be used to reconstruct in a spectaclelens both the lens horizontal and reference points, such as the distanceand near reference points, the so-called fitting point defined inChapter 5.24 of the EN ISO 13 666:1998 standard or the prism referencepoint defined in Chapter 14.2.12 of the EN ISO 13 666:1998 standard.

Pursuant to the EN ISO 13 666:1998 standard, the fitting point is apoint on the front surface of a spectacle lens or spectacle lenssemi-finished product, which, according to the specification from themanufacturer, should serve as reference point for positioning thespectacle lens in front of the eyes.

In the case of uncut spectacle lenses, which an optician obtains from aspectacle lens producer for a spectacle wearer on account of arefraction deficit determined for the spectacle wearer, the orientationof these points with the aforementioned markings is specifiedimplicitly. That is to say, an optician can establish the distance andnear reference point, the fitting point and the prism reference point onthe basis of the aforementioned markings or on the basis of figures thatare printed on the spectacle lenses and referenced to the markings.Pursuant to the EN ISO 13 666:1998 standard, the prism reference pointis the point specified by a manufacturer on the front surface of aprogressive spectacle lens or a progressive spectacle lens semi-finishedproduct at which the prismatic effects of the completed lens have to bedetermined.

This makes it easier for an optician to align the uncut spectacle lenscorrectly prior to grinding and then insert it into a spectacle frame inthe correct position, such that the spectacle wearer is provided withoptimal vision.

This disclosure understands individual data of spectacles to mean, inparticular, so-called spectacle-wearer-specific fitting data of thespectacles, i.e., data from the group of refractive power of a spectaclelens of the spectacles, refractive power distribution of a spectaclelens of the spectacles, the position of the near reference point and theposition of the distance reference point of a spectacle lens of thespectacles in a coordinate system that is referenced to the spectaclesand hence, indirectly, to a spectacle wearer who wears these spectaclesas well. This disclosure understands individual data of spectacles tomean also the orientation of the at least two markings on a progressivespectacle lens according to the DIN EN ISO 8980-2:2004 standard, in acoordinate system that is referenced to the spectacles in which theprogressive lens is arranged.

SUMMARY

It is an object of the disclosure to facilitate checking of theindividual data of spectacles with spectacle lenses held therein.

This object is achieved by an apparatus as disclosed herein.

The apparatus according to the disclosure for measuring individual dataof spectacles arranged in a measurement position, the spectacles havingat least one of a left spectacle lens and a right spectacle lens,contains a display for displaying a test structure. The apparatus has animage capture device for capturing the test structure with an imagingbeam path which passes through the left spectacle lens and/or the rightspectacle lens of the spectacles. Moreover, there is a computer unit inthe apparatus. The computer unit contains a computer program thatdetermines a refractive power distribution for at least a section of theleft spectacle lens and/or the right spectacle lens from the image ofthe test structure captured by the image capture device and a knownspatial orientation of the display relative to the image capture deviceand also, typically, a known spatial orientation of the spectaclesrelative to the image capture device.

An apparatus according to the disclosure for measuring individual dataof spectacles typically contains a mount which defines a known spatialorientation of the spectacles relative to the image capture device forspectacles mounted thereon which are arranged in the measurementposition. This mount may be formed in a receptacle of the apparatus forarranging the spectacles in the measurement position. As an alternativehereto, or additionally, an apparatus according to the disclosure formeasuring individual data of spectacles may have a device fordetermining the spatial orientation of spectacles arranged in themeasurement position relative to the image capture device. By way ofexample, the device can be a holder, for example at least one leg of thespectacles, which anchors the spectacles with a defined spatialorientation within the apparatus according to the disclosure.

The method according to the disclosure for measuring individual data ofspectacles arranged in a measurement position provides for provisionbeing made of a test structure and the test structure then being imagedby way of an imaging beam path, which passes through at least one of aleft spectacle lens and a right spectacle lens of the spectaclesarranged in the measurement position.

The refractive power distribution of the left spectacle lens and/or theright spectacle lens is then determined from the coordinates of the teststructure and the captured image of the test structure and, typically,from the position of the left spectacle lens and/or the right spectaclelens relative to the test structure or the image of the test structure,for example by way of a computer program by means of image evaluation.

The test structure is typically two-dimensional. However, a teststructure in the method according to the disclosure may also bethree-dimensional. It should be noted that a three-dimensional teststructure, for example a test structure in the form of an object with aspatial extent or a test structure in the form of a plurality of partialstructures arranged in different planes that are held in a glass cube,provides the option of deducing the position of the spectacle lens inthe measurement set-up, the ratio of the radii of curvature, therefractive index of a spectacle lens or the thickness thereof inspectacles which are arranged in the measurement position in theapparatus for measuring individual data of the spectacles, by combiningthrough calculation light rays from different distances within the scopeof the disclosure.

Here, in particular, an aspect of the disclosure is that the computerprogram ascertains the refractive power distribution in a coordinatesystem that is referenced to a coordinate system of the spectacles.Here, a coordinate system of the spectacles is understood to mean acoordinate system which is fixed in relation to the spectacles.Alternatively or additionally, it is also possible that the computerprogram of the computer unit determines the refractive powerdistribution in a coordinate system that is referenced to a coordinatesystem of the left and/or right spectacle lens.

The apparatus can also be designed as an image capture device forcapturing a section of the spectacle frame of spectacles arranged in ameasurement position, the section defining a coordinate system of thespectacles.

In particular, an aspect of the disclosure is that the image capturedevice captures the test structure in an image plane conjugate to theleft spectacle lens and/or in an image plane conjugate to the rightspectacle lens.

The image capture device typically comprises at least one camera, moretypically at least two cameras and even more typically at least threecameras.

The image capture device may also have a first camera with a first imageplane and a second camera with a second image plane, wherein the leftspectacle lens of spectacles arranged in a measurement position isimageable in the first image plane and/or the right spectacle lens ofspectacles arranged in a measurement position is imageable in the secondimage plane.

In an apparatus according to the disclosure, provision can also be madefor the first camera to have a camera optical unit with an optical axisthat passes through the left spectacle lens of spectacles, with a leftspectacle lens, arranged in a measurement position, and for the secondcamera to have a camera optical unit with an optical axis that passesthrough the right spectacle lens of spectacles, with a right spectaclelens, arranged in a measurement position, wherein the optical axis ofthe camera optical unit of the first camera is parallel to the opticalaxis of the camera optical unit of the second camera.

It should be noted that, by way of an image capture device whichfacilitates capturing of sections of the spectacles with two, three oreven more cameras with different optical axes in the apparatus formeasuring individual data of spectacles, it is possible for the accuracyof the individual data of spectacles ascertained therewith to beincreased.

Here, provision can also be made for the first camera to have a cameraoptical unit with an optical axis which passes through the leftspectacle lens of spectacles, with a left spectacle lens, arranged inthe measurement position, and for the second camera to have a cameraoptical unit with an optical axis which passes through the rightspectacle lens of spectacles, with a right spectacle lens, arranged in ameasurement position, wherein the optical axis of the camera opticalunit of the first camera includes a stereo angle α with the optical axisof the camera optical unit of the second camera.

In an apparatus according to the disclosure, provision can furthermorebe made for the first camera of the image capture device to have acamera optical unit with an optical axis which passes through the leftspectacle lens of the spectacles arranged in the measurement positionand for the third camera of the image capture device to have a cameraoptical unit with an optical axis which passes through the rightspectacle lens of the spectacles arranged in the measurement position,wherein the optical axis of the camera optical unit of the first cameraincludes a stereo angle α′ with the optical axis of the camera opticalunit of the third camera and wherein the second camera, with the opticalaxis of the camera optical unit, respectively includes a stereo angle βwith the optical axes of the camera optical units.

The apparatus may also have an illumination device for providingillumination light with an illumination beam path which, along theoptical axis of the camera optical unit of the first camera, passesthrough the left spectacle lens of spectacles, with a left spectaclelens, arranged in a measurement position and which, along the opticalaxis of the camera optical unit of the second camera, passes through theright spectacle lens of spectacles, with a right spectacle lens,arranged in a measurement position.

It is also an aspect of the disclosure that the image capture device hasa camera with an image plane, wherein the left spectacle lens ofspectacles arranged in a measurement position is imageable in the imageplane and/or the right spectacle lens of spectacles arranged in ameasurement position is imageable in the image plane. Here, inparticular, it is a concept of the disclosure to provide an illuminationdevice for providing illumination light with an illumination beam paththat is directed, along the optical axis of the camera optical unit,onto spectacles arranged in a measurement position.

Here, it is advantageous if the apparatus contains an adjustablereflector which, in a first setting, reflects the illumination lightwhich passes through the left spectacle lens and/or the right spectaclelens of spectacles arranged in a measurement position at least partlyback through the left spectacle lens and/or the right spectacle lens andwhich, in a second setting that differs from the first setting, uncoversthe imaging beam path for capturing the test structure, displayed on thedisplay, with the image capture device. By way of example, thisreflector can be arranged on a rotatable disk which is typically drivenby motor and which has at least one sector that transmits light.

The disclosure also extends to a system for checking individual data ofglazed spectacles by way of an apparatus as specified above. Such asystem comprises an apparatus as specified above. In order to checkindividual data, individual data of spectacles are measured in thesystem and the measured data are compared to an intended value ofcorresponding data.

Moreover, the disclosure also extends to a computer program producthaving a computer program for providing a test structure and/or forcapturing an image of the test structure by way of an imaging beam pathwhich passes through a left and/or right spectacle lens of thespectacles arranged in the measurement position and/or for determiningthe refractive power distribution of a left spectacle lens and/or aright spectacle lens of spectacles, by way of a computer unit.

According to the disclosure, provision can be made, in a system forchecking individual data, for providing a device for ascertaining the UVabsorption behavior of a right and/or left spectacle lens of thespectacles. Within the scope of the disclosure, it is also possible insuch a system to relate data, e.g., data captured by a camera, about asituation-dependent pupil orientation in a coordinate system that isfixed in relation to the spectacles of a spectacle wearer to theindividual data, in particular spectacle-wearer-specific data,ascertained in an apparatus as specified above in order to be able tomake a statement as to whether the left and/or right spectacle lens hasbeen correctly inserted into the spectacles and whether it is seatedcorrectly there. Alternatively or additionally, it is also possible insuch a system to compare the intended data of a lens design with therefractive power distribution ascertained for a left and/or rightspectacle lens of the spectacles to be able to make a statement as towhether the checked spectacles contain the correct spectacle lenses.

In one exemplary embodiment of the disclosure, the apparatus formeasuring individual data of spectacles arranged in a measurementposition, the spectacles having a left and/or a right spectacle lens,comprises at least:

a display for displaying a typically stationary test structure,

optionally, an illumination device for producing UV light,

optionally, a reflector which comprises at least one region thattransmits visible light, typically illumination light, and at least oneregion which reflects light, typically illumination light, back,

optionally, an illumination device for producing illumination light,

an image capture device for capturing the typically stationary teststructure, comprising at least one camera, typically at least twocameras,

a computer unit with a computer program which determines at least therefractive power distribution for at least a section of the leftspectacle lens and/or the right spectacle lens from the image of thetypically stationary test structure captured by the image capture deviceand a known spatial orientation of the display relative to the imagecapture device and, optionally, a known spatial orientation of thespectacles relative to the image capture device.

In an exemplary embodiment of the disclosure, the apparatus formeasuring individual data of spectacles arranged in a measurementposition, the spectacles having a left and/or a right spectacle lens,comprises:

a display for displaying a typically stationary, typicallytwo-dimensional test structure,

optionally, a reflector which comprises regions that transmit and do nottransmit light, typically visible light, typically illumination light,wherein the reflector is typically arranged between the display and thespectacles to be measured and is typically rotatable,

optionally, an illumination device for producing illumination light,

an image capture device for capturing the typically stationary,typically two-dimensional test structure, the image capture devicecomprising at least two cameras, and

a computer unit with a computer program which determines at least therefractive power distribution for at least a section of the leftspectacle lens and/or the right spectacle lens and optionally thespatial orientation of permanent markings in the left spectacle lensand/or right spectacle lens from the image of the typically stationarytest structure captured by the image capture device and a known spatialorientation of the display relative to the image capture device.

In a further exemplary embodiment of the disclosure, the apparatus formeasuring individual data of spectacles arranged in a measurementposition, the spectacles having a left and/or a right spectacle lens,comprises:

a display for displaying a typically stationary, typicallytwo-dimensional test structure,

at least one mount for the spectacles and/or at least one mount for theright spectacle lens and/or at least one mount for the left spectaclelens, wherein these mounts are typically situated on the rest for thespectacles,

an image capture device for capturing the typically stationary,typically two-dimensional test structure, comprising at least onecamera, typically at least two cameras, and

a computer unit with a computer program which determines at least therefractive power distribution for at least a section of the leftspectacle lens and/or the right spectacle lens from the image of thetypically stationary, typically two-dimensional test structure capturedby the image capture device and a known spatial orientation of thedisplay relative to the image capture device and also, optionally, aknown spatial orientation of the spectacles relative to the imagecapture device.

BRIEF DESCRIPTION OF THE DRAWINGS

Below, exemplary embodiments of the disclosure, which are schematicallydepicted in the drawings, are described, wherein:

FIG. 1 shows a first apparatus for measuring individual data ofspectacles by way of an image capture device having a first camera and asecond camera;

FIG. 2 shows, in a section, a partial view of the apparatus from FIG. 1;

FIG. 3 shows a spectacle lens of progressive spectacles with markingsthat define a local coordinate system;

FIG. 4 shows spectacles with a measurement leg for determining the pupilorientation of an observation person;

FIG. 5 shows an embodiment of a reflector disk in an apparatus formeasuring individual data of spectacles;

FIG. 6A shows an exemplary embodiment of a reflector disk in anapparatus for measuring individual data of spectacles;

FIG. 6B shows another exemplary embodiment of a reflector disk in anapparatus for measuring individual data of spectacles;

FIG. 7 shows a second apparatus for measuring individual data ofspectacles;

FIG. 8 shows a third apparatus for measuring individual data ofspectacles by way of an image capture device containing only one camera;

FIG. 9 shows a fourth apparatus for measuring individual data ofspectacles by way of an image capture device having a first camera, asecond camera, and a third camera;

FIG. 10 shows the image fields of the first camera, second camera, andthe third camera with spectacles to be measured;

FIG. 11 shows, in a section, a partial view of the apparatus from FIG.9; and

FIG. 12 shows a flowchart regarding the measurement of individual dataof spectacles by way of an apparatus according to the disclosure.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

The apparatus 10 shown in FIG. 1 serves to measure individual data ofspectacles 14. The apparatus 10 has a receptacle 12 for arrangingspectacles 14 to be measured in a measurement position on a mount 15 forthe spectacles 14, the spectacles having a left spectacle lens 16 and aright spectacle lens 18. The mount 15 for the spectacles 14 has a mount20 for the left spectacle lens 16 and a mount 22 for the right spectaclelens 18. In the measurement position, the left spectacle lens 16 restson a mount 20 and the right spectacle lens 18 rests on a mount 22. Themeasurement position of spectacles 14 arranged in the receptacle 12 isuniquely defined by means of the mount 15.

It should be noted that, in the case of a modified embodiment of theapparatus 10, provision can also be made for a mount 15 which has one ormore mounts, on which spectacles 14 arranged in the receptacle 12 restwith the frame or a frame part or a spectacle lens edge and a leftspectacle lens 16 or right spectacle lens 18.

It should also be noted that, in a further, modified embodiment of theapparatus 10, provision can also be made for a mount 15, on whichrimless spectacles rest with a spectacle lens edge of at least onespectacle lens of the spectacles 14.

In the apparatus 10, there is a two-dimensional display 24 fordisplaying a two-dimensional test structure 25. The apparatus 10contains an image capture device 26. The image capture device 26 has afirst camera 28 and a second camera 30. The first camera 28 and thesecond camera 30 each have a camera optical unit 32, 34 which isdesigned for capturing, in an image plane 36, 38 and by way of an imagesensor 40, 42 in the first and second camera 28, 30, respectively, thetest structure 25 that is displayed by means of the display 24. Here,the camera optical unit 32 of the first camera 28 has an optical axis 44that passes through the left spectacle lens 16 of spectacles 14 arrangedin the measurement position in the receptacle of the apparatus 10.Accordingly, the camera optical unit 34 of the second camera 30 has anoptical axis 46 that extends through the right spectacle lens 18 ofspectacles 14 arranged in the measurement position in the receptacle ofthe apparatus 10.

It should be noted that, in a modified embodiment of the apparatus 10,provision can also be made of a mount 15, on which the spectacles 14rest with their frame or on which spectacles 14 to be measured in theapparatus 10 rest on their side facing the cameras 28, 30.

The optical axes of the first camera 28 and of the second camera 30 areparallel to one another in the apparatus 10. The mount 20 for the leftspectacle lens 16 and the mount 22 for the right spectacle lens 18 inthe apparatus 10 are situated at or near a reference surface 50, 52passing through the spectacle lens 16 and the spectacle lens 18,respectively, the reference surface being approximately conjugate to theimage plane 36, 38 of the first and second camera 28, 30, respectively.That is to say, the image plane 36 of the camera 28 is imaged in focusonto the reference surface 50 by means of the camera optical unit 32 andthe image plane 38 of the camera 30 is imaged in focus onto thereference surface 52 by means of the camera optical unit 34.

The mount 20 and the mount 22 are arranged in the apparatus 10 in such away that the markings according to the DIN EN ISO 8980-2:2004 standard,which, as a rule, are embodied as permanent engravings, lie on the leftspectacle lens 16 and right spectacle lens 18 of the spectacles 14 inthe conjugate planes 50 and 52, respectively, or near these planes.

Here, the depth of field of the camera optical units 32, 34 of the firstcamera 28 and second camera 30 in the apparatus 10 is matched to theorientation of the display 24 in such a way in this case that a patterndisplayed therewith is still resolved in the image planes 36, 38 of thefirst camera 28 and the second camera 30. That is to say, a brightnessdistribution caused in the image planes 36, 38 of the first camera 28and second camera 30 by the pattern displayed on the display 24 can beuniquely transformed, in a mathematically reversible manner, to thebrightness distribution of the pattern displayed on the display 24.

It should be noted that the pattern displayed on the display 24 may be,for example, a point pattern, with the first camera 28 and second camera30 respectively facilitating the determination of the center of thepoints in the pattern. It should also be noted that, in principle, linepatterns can also be displayed on the display 24 instead of a pointpattern, the optical power of the left spectacle lens 16 and rightspectacle lens 18 of spectacles 14 arranged in the apparatus 10 thenoptionally being determined not only in absolute but also inphase-shifting terms on the basis of the line patterns, typically usingdeflectometric evaluation techniques.

Thus, by means of the image sensors 40, 42 in the cameras 28, 30, theimage capture device 26 in the apparatus 10 is designed, firstly, torecord the left spectacle lens 16 and right spectacle lens 18 of thespectacles 14 and, secondly, to capture the image of the test structure25 displayed on the display 24 by way of an imaging beam path that isguided through the left spectacle lens 16 and the right spectacle lens18.

To this end, the camera optical units 32, 34 are focused in theapparatus 10 on the spectacle lenses 16, 18 resting on the mount 20, 22in the receptacle 12. However, in the process, the camera optical units32, 34 ensure a depth-of-field range which ensures the in-focus captureof the test structure 25 in the image planes 36, 38 of the image sensors40, 42 by way of an imaging beam path passing through the spectaclelenses 16, 18.

The apparatus 10 contains an illumination device 54 for providingillumination light having an illumination beam path 56, 58 which, alongthe optical axis 44, 46 of the camera optical unit 32 of the firstcamera 28 and the camera optical unit 34 of the second camera 30,respectively, passes through the left spectacle lens 16 and rightspectacle lens 18 of the spectacles 14 to be measured. To this end, theillumination device 54 has light sources 57, 59 for producingillumination light. It has a first beam splitter 60, which is positionedbetween the camera optical unit 32 of the first camera 28 and the leftspectacle lens 16 of spectacles 14 arranged in the measurement position,and a second beam splitter 62, which is situated between the cameraoptical unit 34 of the second camera 30 and the right spectacle lens 18of spectacles 14 arranged in the measurement position.

There is a rotatably mounted reflector disk, which acts as an adjustablereflector 76, in the apparatus 10 between the two-dimensional display 24and the receptacle 12 for measuring spectacles 14 arranged therein. Thereflector disk has sectors 77 which reflect the illumination light ofthe illumination device 54 back to the first camera 28 and to the secondcamera 30 in the image capture device 26 through the left spectacle lens16 and right spectacle lens 18, respectively. By contrast, the sectors79 of the reflector disk transmit the light from the illumination device54. The reflector disk can be moved around an axis of rotation 80 by wayof a motor-driven drive 78.

The apparatus 10 moreover has a further illumination device 81 withlight sources 83 for producing UV light. The illumination device 81 isdesigned for providing UV light with a beam path that passes through theleft spectacle lens 16 and right spectacle lens 18 of spectacles 14arranged in the measurement position in the receptacle 12 of theapparatus 10. The illumination device 81 serves to determine, by meansof the image sensors 40, 42 of the cameras 28, 30, the UV absorptionbehavior of the spectacle lenses 16, 18 of spectacles arranged in thereceptacle 12 of the apparatus 10.

In order to control the display 24 and the image capture device 26, andalso the illumination device 54, the further illumination device 81 andthe movement of the reflector disk in the apparatus 10, the latter has acomputer unit 82. The computer unit 82 contains a computer programwhich, in a coordinate system 84 that is fixed in relation to theapparatus 10 and for at least one section of the left spectacle lens 16and for at least one section of the right spectacle lens 18, determinesa refractive power distribution that is referenced to a coordinatesystem 85 of the spectacles 14 from the image of the spectacles 14 andthe test structure 25 captured by way of the image capture device 26 andthe relative position of the display 24 and image capture device 26 andthe relative position of image capture device 26 and the mount 20 forthe left spectacle lens 16 and the relative position of the imagecapture device 26 and the mount 22 for the right spectacle lens 18.

FIG. 2 is a partial view of the apparatus 10 in the form of a schematicsection along the line II-II from FIG. 1 and serves to explain how thecomputer program in the computer unit 82 determines the refractive powerdistribution for the left spectacle lens 16 and for the right spectaclelens 18 in the apparatus 10.

The computer program in the computer unit 82 contains an algorithm whichcalculates the local distortion of the test structure 25 from thedifference image of the image captured with the camera 28 when nospectacles are arranged in the receptacle 12 of the apparatus 10 fromFIG. 1 and when spectacles 14 are situated there. Then, deflectionangles for the light rays imaging the test structure 25 are determinedfrom the calculated distortion. Thereafter, the computer programascertains the local deflection angle α of the light rays ray_r, whichreach the camera 28 or 30 through a spectacle lens 16, 18 from theindividual points P_(grid) of the test structure 25 displayed on thedisplay 24, from the distortion of the image 87 of the test structure 25displayed on the display 24 in the image plane 36 of the camera 28 andthe known relative position of the spectacle lens 16 with respect to thecamera 28 and in relation to the display 24. Here, the referencesurfaces 50, 52 are respectively used as virtual planes of refraction.The computer program in the computer unit 82 accordingly evaluates thedistortion of the image of the test structure 25 displayed on thedisplay 24 in the image plane 38 of the camera 30. Thus, thisdeflectometric evaluation method exploits the fact that the spatialcoordinates in x, y, z of each point P_(grid) displayed on the display24 are known.

The computer program calculates the centroid of each point P_(cam) inthe image plane 36, 38 of a camera 28, 30. Then, the computer programascertains centroid light rays from these points P_(cam) in the form ofvectors ray_in. The computer program intersects the centroid light raysray_in with the plane of the display 24. In this way, the computerprogram calculates a multiplicity of virtual observation pointsP_(virtual) of the test structure 25 in the plane of the display 24.

The offset Δ=P_(grid)−P_(virtual) of a point P_(grid) displayed on thedisplay 24 from the corresponding virtual observation point P_(virtual)describes the shift of the point P_(grid) caused by the optical power ofthe spectacle lens 16 or 18.

In order to determine the optical power of the spectacle lens 16 orspectacle lens 18, the computer program ascertains the locationP_(test object), at which a light ray emanating from the display 24passes through a corresponding spectacle lens 16, 18, from the knownrelative position of the mounts 20, 22 in the apparatus 10 in relationto the display 24 and the image planes 36, 38 of the cameras 28 and 30,respectively. Then, the local ray deflections for light rays which passthrough the spectacle lenses 16, 18 of spectacles 14 arranged in theapparatus 10 are respectively determined in the computer unit 82 fromthe three points P_(test object), P_(virtual), and P_(grid) by way ofthe computer program. From this, the computer program then ascertainsthe refractive power distribution which corresponds to local beamdeflections of these light rays caused by the spectacle lens 16 or thespectacle lens 18.

Thus, in the apparatus 10, the refractive power distribution of the leftspectacle lens 16 and/or the right spectacle lens 18 is determined fromthe coordinates of the test structure 25 and the captured image of thetest structure 25 and from the position of the left spectacle lens 16and/or the right spectacle lens 18 relative to the test structure 25 orthe image of the test structure 25.

Here, the computer program typically also takes account of parameters ofthe spectacle lenses 16, 18 of spectacles 14 to be measured, theparameters being specific to the spectacle lenses 16, 18, for examplethe edge parameter thereof, the ratio of the radii, the centralthickness, the edge thickness or else radii gradations. Such parametersmay also contain information about the center and edge thickness of aspectacle lens which has a known diameter. A parameter that is specificto the spectacle lens 16, 18 may also be the edge thickness that isdefined by way of the frame of spectacles in which a spectacle lens isinserted. A parameter that is specific to a spectacle lens 16, 18 mayalso be the radii of curvature of an optically effective surface.

This is because the more accurately the form of a spectacle lens 16, 18is known in advance, the more accurately the overall refractive powerdistribution and the exact surface topography can be determined for thespectacle lens 16, 18 by means of the computer program in the computerunit 82.

It should be noted that the apparatus 10 also facilitates a capture ofstereometric data relating to the spectacle lenses 16, 18 arranged inthe spectacles 14 by way of the camera pair formed by the first camera28 and the second camera 30, it being possible to ascertain, firstly,information about the form, e.g., the ratio of radii of curvature of thefront side and rear side or information about the glass thickness, and,secondly, information about the position of a spectacle lens 16, 18 inspectacles 14 and/or the refractive index of the material of thespectacle lens from the stereometric data.

FIG. 3 shows a spectacle lens 16 of progressive spectacles havingmarkings 86, 88 corresponding to the DIN EN ISO 8980-2:2004 standard,the markings defining the local spectacle lens coordinate system 90.Moreover, the orientation of the near reference point 92 and of thedistance reference point 93 have been made visible on the spectacle lens16.

In order to ensure that lens specifications on a spectacle lens do notimpair the vision of the spectacle wearer, the lens specificationsapplied on an uncut spectacle lens on the part of the producer areremoved to the greatest possible extent by an optician before the lensis inserted into a spectacle frame. As a consequence, it may be possibleto ascertain e.g., the orientation of the near and distance referencepoints 92, 93 of a spectacle lens 16 only with comparatively high outlayafter insertion into the frame of spectacles 14.

The markings 86, 88 defining the local spectacle lens coordinate system90 are permanent markings and act as phase objects for the light whichare only visible with difficulty by the naked eye.

FIG. 4 shows an observer 94 with spectacles 14 and a measuring leg 96fastened thereto, the measuring leg serving to determine the fittingparameters for the left spectacle lens 16 and right spectacle lens 18 inthe form of the interpupillary distance and the required orientation ofthe near reference point 92 and of the distance reference point 93 in acoordinate system 85 that is fixed in relation to the spectacles 14.

By way of example, these fitting parameters can be determined by virtueof the observer 94 being recorded with a camera (not shown here) whenlooking into the vicinity and looking into the distance, and theorientation of the pupils then being ascertained by means of imageprocessing in the coordinate system 85 that is fixed in relation to thespectacles 14.

The apparatus 10 shown in FIG. 1 is designed to capture the orientationof the markings 86, 88 and, in the process, reference the spectacle lenscoordinate system 90 that is defined by these markings 86, 88 to thecoordinate system of the spectacles 14.

The illumination light of the illumination device 54 in the apparatus10, guided along the optical axes 44, 46 of the camera optical units 32,34 shown in FIG. 1 passes through the left spectacle lens 16 and rightspectacle lens 18 of spectacles 14 arranged in the receptacle 12 of theapparatus 10. This illumination light is reflected at thelight-reflecting sectors 77 of the reflector disk and then reachesthrough the left or right spectacle lens 16, 18 to the image planes 36,38 of the first camera 28 and second camera 30, respectively, via thebeam splitters 60, 62.

FIG. 5 shows an embodiment of the rotatable reflector disk that can beused in the apparatus of FIG. 1. In the sections of the light-reflectingsectors 77, the reflector disk has markings 100 that extend in arcuatefashion. In the apparatus 10, the position of these markings 100 iscaptured by a photoelectric sensor 102 which is connected to thecomputer unit 82 and which acts as a rotation sensor. This rotationsensor serves for synchronizing the image capture by means of thecameras 28, 30 in the image capture device 26 on the basis of triggersignals which indicate the rotational position of the reflector disk.

The phase object of the markings 86, 88 on the spectacle lenses 16, 18has as a consequence that the light is scattered more strongly thereonthan in the remaining regions of the spectacle lenses 16, 18. Asdescribed in DE 103 33 426 B4, paragraph [0024], to which reference ismade herewith in the entirety thereof and the disclosure of which isincorporated into the description of this application, these can then becaptured by means of the first camera 28 or second camera 30 as darkstructures on a bright background.

By virtue of a section of the spectacle frame of the spectacles 14, fromwhich the coordinate system 85 of the spectacles 14 can be determined bymeans of image evaluation, being captured by means of the first camera28 or second camera 30, the apparatus 10 is able to reference thiscoordinate system 85 to the coordinate system 84 of the apparatus 10.

When the light-reflecting sectors 77 of the reflector disk at leastpartly uncover the left spectacle lens 16 and right spectacle lens 18 ofspectacles, a test structure 25 displayed on the display 24 can beidentified by means of the cameras 28, 30.

By evaluating, by means of the computer unit 82, the images of thecameras 28, 30 depending on the rotational position of the reflectordisk, it is possible to determine, in the coordinate system 84 of theapparatus 10, the distribution of the refractive power of the leftspectacle lens 16 and right spectacle lens 18 of spectacles 14 arrangedin the receptacle 12. Moreover, as a result, it is possible by means ofthe apparatus 10 to reference the spectacle lens coordinate system 90for the left spectacle lens 16 and right spectacle lens 18 of thespectacles 14 to the coordinate system 84 of the apparatus 10 and to thecoordinate system 85 of the spectacles 14.

In an alternative embodiment of the apparatus 10, the cameras 28, 30have adjustable camera optical units 32, 34, which are focused,alternately and depending on the rotational position of the reflectordisk, on the display 24 and the left spectacle lens 16 and rightspectacle lens 18 of the spectacles 14 by means of an autofocus system.This measure ensures the in-focus imaging of the test structure 25displayed on the display 24 and of the markings 86, 88 on the leftspectacle lens 16 and right spectacle lens 18 of the spectacles 14.

FIG. 6A and FIG. 6B show alternative embodiments of an adjustablereflector 76′, 76″ having a reflector disk for an apparatus 10, by meansof which individual data of spectacles 14 can be measured.

FIG. 7 shows a second apparatus 110 for measuring individual data ofspectacles. As far as the components of the apparatus 110 correspond tothe components of the apparatus 10 described above, they are identifiedby the same numerals as reference signs.

Unlike the apparatus 10, the cameras 28, 30 of the image capture device26′ have optical axes 44, 46 inclined in relation to one another in thiscase, the optical axes forming an acute angle α. By means of the imagecapture device 26′, it is possible, in this case, to capture on theimage planes of the image sensors 40, 42 of the cameras 28, 30 mutuallyoverlapping sections of the spectacle lenses 16, 18 of spectaclesarranged in the receptacle 12 of the apparatus 110. In order to capturethe markings 86, 88, described on the basis of FIG. 3, on a spectaclelens 16, 18, a stripe pattern is displayed on the display 24, the stripepattern having a varying spatial phase and extending in differentdirections. Then, as described in e.g., U.S. Pat. No. 8,081,840 B2, inparticular in column 5, lines 10 to 50, to which reference is madeherewith in the entirety thereof and the disclosure of which isincorporated into the disclosure of this application, a deflectometricphase amplitude image is calculated in the computer unit 82 from theimage of this stripe pattern captured by means of the cameras 28, 30.This calculated phase amplitude image has a contrast which is so greatthat the data record of these calculated phase amplitude imagescontains, in particular, the information regarding the position of themarkings.

FIG. 8 shows a third apparatus 210 for measuring individual data ofspectacles 14. As far as the components of the apparatus 210 correspondto the components of the apparatus 10 described above, they areidentified by the same reference numerals.

The apparatus 210 has an image capture device 26″ in which there is onlyone camera 28 with a camera optical unit 32 having an optical axis 44which passes through spectacles 14 arranged in the receptacle 12 of theapparatus 210 between the first spectacle lens 16 and the secondspectacle lens 18.

FIG. 9 shows a fourth apparatus 310 for measuring individual data ofspectacles 14. As far as the components of the apparatus 310 correspondto the components of the apparatus 10 described above, they areidentified by the same reference numerals.

The apparatus 310 has a receptacle 12 for arranging spectacles 14 to bemeasured in a measurement position for the spectacles 14, the spectacleshaving a left spectacle lens 16 and a right spectacle lens 18.

In the apparatus 310, there is a two-dimensional display 24 fordisplaying a two-dimensional test structure 25.

The apparatus 310 has an image capture device 26′″, in which there arethree cameras 28, 28′, and 28″. The cameras 28, 28′, 28″ each contain acamera optical unit 32, 32′, 32″ which is designed for capturing, in animage plane 36, 36′, 36″ and by way of an image sensor 40, 40′, 40″, thetest structure 25 that is displayed by means of the display 24. Thecamera optical units 32, 32′, 32″ have optical axes 46, 46′, and 46″that are inclined in relation to one another. On the side of the cameraoptical units 32, 32′, and 32″ that faces the display 24, thererespectively is an illumination device 54, 54′, 54″ having a beamsplitter 60 through which the optical axes 46, 46′, and 46″ pass and alight source 57 for impinging the spectacles 14 that are arranged in thereceptacle 12 with illumination light. The camera optical units 32, 32′,and 32″ in the apparatus 310 each have focal planes which intersect thereference surfaces 50, 52 which pass through the right spectacle lens 18and/or left spectacle lens 16 of the spectacles 14 or which abut theleft spectacle lens 16 or right spectacle lens 18 of the spectacles 14or abut the reference surfaces 50, 52.

Here, the depth of field of the camera optical units 32, 32′, and 32″ inthe apparatus 310 is matched to the orientation of the display 24 insuch a way in this case that a pattern displayed therewith is stillresolved in the image planes 36, 36′, and 36″. That is to say, abrightness distribution caused in the image planes 36, 36′, and 36″ ofthe first camera 28, second camera 28′, and third camera 28″ by thepattern displayed on the display 24 can be uniquely transformed, in amathematically reversible manner, to the brightness distribution of thepattern displayed on the display 24.

In FIG. 10, it is possible to see the image field 128 of the firstcamera 28, the image field 128′ of the second camera 28′, and the imagefield 128″ of the third camera 28″ along with spectacles 14 arranged inthe apparatus 310 for measurement purposes.

The image fields 128, 128′, and 128″ of the cameras 28, 28′, and 28″overlap and completely cover the spectacle lenses 16, 18 of spectacles14 arranged in the receptacle 12 of the apparatus 310 and ensure that amarking 86, 88 that is embodied on a spectacle lens 16, 18 as apermanent marking lies in the mutually overlapping image fields 128,128′ or 128′, 128″ of at least two cameras 28, 28′ on the one hand and28′ and 28″ on the other hand.

In the apparatus 310, there is a computer unit 82 which contains acomputer program for ascertaining the spatial orientation of the leftspectacle lens 16 and right spectacle lens 18 by means of imageevaluation and triangulation from the image data captured by the cameras28, 28′, 28″. The computer unit 82 in the apparatus 310 is a device fordetermining the spatial orientation relative to the image capture device26′ of spectacles 14 arranged in the receptacle 12. Hence, it isadvantageously possible in the apparatus 310 to automatically triggermeasuring the spectacles 14 by arranging spectacles 14 in the receptacle12 of the apparatus 310 and to determine the spatial orientation of theleft spectacle lens 16 and right spectacle lens 18 relative to the imagecapture device 26′.

FIG. 11 is a partial view of the apparatus from FIG. 9. It serves toexplain how the computer program in the computer unit 82 determines therefractive power distribution for the left spectacle lens 16 and theright spectacle lens 18 in the apparatus 10.

The computer program in the computer unit 82 in the apparatus 310 alsocontains an algorithm which calculates the local distortion of the teststructure 25 from the difference image of the image captured with thecamera 28 when no spectacles are arranged in the receptacle 12 of theapparatus 310 from FIG. 9 and when spectacles 14 are situated there.Then, deflection angles for the light rays imaging the test structure 25are determined from the calculated distortion. Here, the referencesurfaces 50, 52 are set as virtual refractive planes, which are curvedin the present case, in the computer program. Then, the computer programascertains local deflection angles α, α′ and α″ of the light raysray_r1, ray_r2, and ray_r3, which reach the camera 28, 28′, or 28″through a spectacle lens 16, 18 from the individual points P_(grid) ofthe test structure 25 displayed on the display 24, from the distortionof the images 87, 87′, and 87″ of the test structure 25 displayed on thedisplay 24 in the image planes 36, 36′, and 36″ of the cameras 28, 28′,and 28″ and the known relative position of the spectacle lens 16 withrespect to the cameras 28, 28′, and 28″ and in relation to the display24. Thus, this deflectometric evaluation method exploits the fact thatthe spatial coordinates in x, y, z of each point P_(grid) displayed onthe display 24 are known.

The computer program in the computer unit 82 then calculates centroidlight rays in the form of vectors ray_in1, ray_in2, and ray_in3, asdescribed on the basis of the apparatuses 10, 110, and 210 describedabove. The computer program intersects the centroid light rays ray_in1,ray_in2, and ray_in3 with the plane of the display 24. In this way, thecomputer program calculates a multiplicity of virtual observation pointsP_(virtual) of the test structure 25 in the plane of the display 24.

The offset Δ=P_(grid) P_(virtual) of a point P_(grid) displayed on thedisplay 24 from the corresponding virtual observation point P_(virtual)describes the shift of the point P_(grid) caused by the optical power ofthe spectacle lens 16 or 18.

In order to determine the optical power of the spectacle lens 16 orspectacle lens 18, the computer program then ascertains the locationP_(test object), at which a light ray emanating from the display 24passes through a corresponding spectacle lens 16, 18, from the knownrelative position of the left spectacle lens 16 and right spectacle lens18 in the apparatus 310 in relation to the display 24 and the imageplanes 36, 36′, and 36″ of the cameras 28, 28′, and 28″. Thereupon, thelocal ray deflections for the light rays which pass through thespectacle lenses 16, 18 of spectacles 14 arranged in the apparatus 310are once again respectively determined in the computer unit 82 from thethree points P_(test object), P_(virtual) and P_(grid) by way of thecomputer program. From this, the computer program then ascertains therefractive power distribution which corresponds to local beamdeflections of these light rays caused by the spectacle lens 16 or thespectacle lens 18.

Thus, in the apparatus 310, the refractive power distribution of theleft spectacle lens 16 and/or the right spectacle lens 18 is once againdetermined from the coordinates of the test structure 25 and thecaptured image of the test structure 25 and optionally from the positionof the left spectacle lens 16 and/or the right spectacle lens 18relative to the test structure 25 or the image of the test structure 25.

It should be noted that the measurement accuracy for determining therefractive power distribution of a left spectacle lens 16 and a rightspectacle lens 18 in spectacles 14 can be increased further, in anapparatus for measuring individual data of spectacles, by virtue ofusing not only three, but four, five, six or even more cameras withcamera optical units that have optical axes inclined in relation to oneanother.

The apparatuses 10, 110, 210, and 310 described above can be used in asystem for checking individual data of glazed spectacles to determinewhether the centration of a spectacle lens in the frame of spectaclescorresponds with the spectacle-wearer-specific fitting parameters,ascertained during the refraction and the fitting, in respect of theinterpupillary distance R/L and the height of the pupils. By way ofexample, such a system can contain a device for evaluating thearrangement of a right spectacle lens and/or a left spectacle lens ofthe spectacles, taking into account a measured refractive powerdistribution in a coordinate system that is fixed in relation to thespectacles. Such a system may also have a device for comparing aspatially resolved refractive power of the right spectacle lens and/orleft spectacle lens of the spectacles with intended values.

The flowchart 150 shown in FIG. 12 serves to explain how the refractivepower distribution and capturing the spatial orientation of permanentengravings on spectacle lenses 16, 18 by measuring spectacles 14arranged in the apparatus 10, 110, 210, and 310 can be combined in sucha system with data about a situation-dependent pupil orientation of theeyes of a spectacle wearer and with the information of intended datarelating to a lens design in such a system.

Using this, it is possible to ascertain whether the corresponding lenseswere incorporated in non-reversed fashion and/or whether they werepossibly interchanged. Such a system renders it possible to checkwhether the axis position of the lenses in the spectacle frame iscorrect. Such a system also renders it possible to find out whether themeasurement values correspond with the provided values. Such a systemalso allows a statement to be made as to whether a spectacle lens hasbeen incorporated into the frame of spectacles in a correct andtension-free manner. Using such a system, it is possible to identifywhether a power distribution measured therein corresponds to theexpected power distribution over the area, whether the pupil orientationfits the refractive power distribution of the spectacle lens, andwhether the refractive power distribution of the spectacle lens ismatched to the viewing direction-dependent or situation-dependent pupilorientation.

It should be noted that, in a system for checking individual data ofspectacles, e.g., spectacle-wearer-specific fitting data, containing oneof the apparatuses 10, 110, 210, or 310 described above, it is alsopossible to make a further qualitative statement about the quality ofmanufactured spectacles from the superposition of the measurement datawith an image of the adaptation. The image data necessary to this endthen exist from the recordings which the optician has obtained whenmeasuring the centering data, for example with the aid of a Relax Visionterminal, as described in, to which reference is made herewith and thedisclosure of which is incorporated in the entirety thereof into thedisclosure of this application. By way of the superposition, it ispossible to quickly make a statement about the correct fit of the lensin the frame. It is advantageous if such images of the pupil orientationfor various viewing positions, for example, distance viewing position,near viewing position and the transition region, or different viewingsituations, such as reading, driving, phoning, working, making music,etc. are evaluated.

Here, what should be noted, in particular, is that statements about thespherical power, the cylinder, and the prism suffice in the simplestcase for a statement as to whether the correct lens was inserted intothe frame. In order to be able to make more in-depth statements aboutthe power distribution, for example in the case of individual designs,in particular in the case of progressive spectacles, intended datarecords of the spectacle lenses are required. If these are available, astatement about the correspondence of the spectacle lens design can bemade by way of an appropriate intended-actual comparison.

Solely determining the surface refractive powers for the spectacle lensof spectacles in such a system renders it possible to make a reasonedstatement as to whether the profile of the surface refractive powers ismatched to the orientation of the pupils of an observation person,particularly in the case of different viewing directions.

In conclusion, the following, in particular, should be noted: Thedisclosure relates to an apparatus 10, 110, 210, 310 and a method formeasuring individual data of spectacles 14 arranged in a measurementposition, the spectacles having a left and/or a right spectacle lens 16,18. The apparatus 10, 110, 210, 310 has a display 24 for displaying atest structure 25. The apparatus 10, 110, 210, 310 contains an imagecapture device 26 for capturing the test structure 25 with an imagingbeam path which passes through the left spectacle lens 16 and/or theright spectacle lens 18 of the spectacles 14. The apparatus 10, 110,210, 310 has a computer unit 82 with a computer program which determinesa refractive power distribution for at least a section of the leftspectacle lens 16 and/or the right spectacle lens 18 from the image ofthe test structure 25 captured by the image capture device 26, 26′, 26″,26′″ and a known spatial orientation of the display 24 relative to theimage capture device 26, 26′, 26″, 26′″ and also typically a knownspatial orientation of the spectacles 14 relative to the image capturedevice 26, 26′, 26″, 26″. In order to measure individual data ofspectacles 14, the spectacles 14 are arranged in a measurement position.Then, according to the disclosure, a test structure 25 is provided.Then, the image of the test structure 25 is captured by way of animaging beam path which passes through a left and/or right spectaclelens 16, 18 of the spectacles 14 arranged in the measurement position.The refractive power distribution of the left spectacle lens 16 and/orthe right spectacle lens 18 is then determined from the coordinates ofthe test structure 25 and the captured image of the test structure 25.

The foregoing description of the exemplary embodiments of the disclosureillustrates and describes the present invention. Additionally, thedisclosure shows and describes only the exemplary embodiments but, asmentioned above, it is to be understood that the disclosure is capableof use in various other combinations, modifications, and environmentsand is capable of changes or modifications within the scope of theconcept as expressed herein, commensurate with the above teachingsand/or the skill or knowledge of the relevant art.

The term “comprising” (and its grammatical variations) as used herein isused in the inclusive sense of “having” or “including” and not in theexclusive sense of “consisting only of.” The terms “a” and “the” as usedherein are understood to encompass the plural as well as the singular.

All publications, patents and patent applications cited in thisspecification are herein incorporated by reference, and for any and allpurposes, as if each individual publication, patent or patentapplication were specifically and individually indicated to beincorporated by reference. In the case of inconsistencies, the presentdisclosure will prevail.

LIST OF REFERENCE NUMERALS

-   10, 110, 210, 310 Apparatus-   12 Receptacle-   14 Spectacles-   15 Mount for spectacles-   16 Left spectacle lens-   18 Right spectacle lens-   20 Mount—left spectacle lens-   22 Mount—right spectacle lens-   24 Display-   25 Test structure-   26, 26′, 26″, 26′″ Image capture device-   28, 28′, 28″, 30 Camera-   32, 32′, 32″, 34 Camera optical unit-   36, 36′, 36″, 38 Image plane-   40, 40′, 40″, 42 Image sensor-   44, 46, 46′, 46″ Optical axis-   50, 52 Reference surface-   54, 54′, 54″ Illumination device-   56, 58 Illumination beam path-   57, 59 Light source-   60, 62 Beam splitter-   76, 76′, 76″ Adjustable reflector (reflector disk)-   77 Sectors-   78 Motor-driven drive-   79 Sectors-   80 Axis of rotation-   81 Illumination device-   82 Computer unit-   83 Light sources-   84, 85 Coordinate system-   86, 88, 100 Marking-   87, 87′, 87″ Image-   90 Spectacle lens coordinate system-   92 Near reference point-   93 Distance reference point-   94 Observer-   96 Measuring leg-   102 Photoelectric sensor-   128, 128′, 128″ Image field-   150 Flowchart

The invention claimed is:
 1. An apparatus for measuring individual dataof spectacles arranged in a measurement position, the spectacles havinga least one of a left spectacle lens with a left permanent marking and aright spectacle lens with a right permanent marking, the apparatuscomprising: a display for displaying a test structure, an image capturedevice configured to capture the test structure with an imaging beampath that passes through at least one of the left spectacle lens and theright spectacle lens of the spectacles arranged in the measurementposition; configured to capture a section of the spectacle frame of thespectacles arranged in the measurement position, the section defining acoordinate system of the spectacles; and configured to capture the leftand right permanent markings, respectively, defining a local,body-inherent coordinate system for the at least one of the leftspectacle lens and the right spectacle lens, an illumination device forproviding illumination light passing through at least one of the leftspectacle lens and the right spectacle lens of the spectacles arrangedin the measurement position, an adjustable reflector which, in a firstsetting, reflects the illumination light having passed through the atleast one of the left spectacle lens and the right spectacle lens of thespectacles arranged in the measurement position at least partly backthrough the at least one of the left spectacle lens and the rightspectacle lens and which, in a second setting that differs from thefirst setting, uncovers the imaging beam path for capturing the teststructure displayed on the display with the image capture device, and acomputer unit having a computer program for determining the coordinatesystem of the spectacles from the section, captured by the image capturedevice, of the spectacle frame of the spectacles arranged in themeasurement position, which, from the captured left and right permanentmarkings of at least one of the left spectacle lens and the rightspectacle lens respectively determines the local, body-inherentcoordinate system for the left spectacle lens and right spectacle lensand references this to the coordinate system of the spectacles, andwhich, from the image of the test structure captured by the imagecapture device and a known spatial orientation of the display relativeto the image capture device, determines at least one of a refractivepower distribution for at least a section of the left spectacle lens,the refractive power distribution being determined in a coordinatesystem that is referenced to the coordinate system of the spectacles andto the local, body-inherent coordinate system for the left spectaclelens, and a refractive power distribution for at least a section of theright spectacle lens, the refractive power distribution being determinedin a coordinate system that is referenced to the coordinate system ofthe spectacles and to the local, body-inherent coordinate system for theright spectacle lens.
 2. The apparatus as claimed in claim 1, whereinthe reflector is arranged on a rotatable disk having at least one sectorthat transmits light.
 3. The apparatus as claimed in claim 1, furthercomprising at least one of: a) a mount for the spectacles arranged inthe measurement position, the mount defining a known spatial orientationof the spectacles relative to the image capture device, and b) a devicefor determining the spatial orientation of the spectacles arranged inthe measurement position relative to the image capture device.
 4. Theapparatus as claimed in claim 1, wherein the image capture devicecaptures the test structure in an image plane conjugate to the leftspectacle lens and/or in an image plane conjugate to the right spectaclelens.
 5. The apparatus as claimed in claim 1, wherein the image capturedevice comprises at least one camera.
 6. The apparatus as claimed inclaim 1, wherein a) the image capture device has a first camera with afirst image plane and a second camera with a second image plane, whereinthe left spectacle lens of spectacles arranged in the measurementposition is imageable in the first image plane and/or the rightspectacle lens of spectacles arranged in the measurement position isimageable in the second image 5 plane; or b) the image capture devicehas a camera with an image plane, wherein the left spectacle lens ofspectacles arranged in the measurement position is imageable in theimage plane and/or the right spectacle lens of spectacles arranged inthe measurement position is imageable in the image plane.
 7. Theapparatus as claimed in claim 1, wherein c) the image capture device hasa first camera with a first image plane, a second camera with a secondimage plane and a third camera with a third image plane, wherein theleft spectacle lens and right spectacle lens of spectacles arranged inthe measurement position are imageable in at least one of the imageplanes.
 8. The apparatus as claimed in claim 7, wherein the first cameraof the image capture device has a camera optical unit with an opticalaxis that passes through the left spectacle lens of the spectaclesarranged in the measurement position and the second camera of the imagecapture device has a camera optical unit with an optical axis whichpasses through the right spectacle lens of the spectacles arranged inthe measurement position, wherein the optical axis of the camera opticalunit of the first camera is parallel to the optical axis of the cameraoptical unit of the second camera, or in that the first camera of theimage capture device has a camera optical unit with an optical axiswhich passes through the left spectacle lens of the spectacles arrangedin the measurement position and the second camera of the image capturedevice has a camera optical unit with an optical axis that passesthrough the right spectacle lens of the spectacles arranged in themeasurement position, wherein the optical axis of the camera opticalunit of the first camera includes a stereo angle α with the optical axisof the camera optical unit of the second camera, or in that the firstcamera of the image capture device has a camera optical unit with anoptical axis that passes through the left spectacle lens of thespectacles arranged in the measurement position and the third camera ofthe image capture device has a camera optical unit with an optical axisthat passes through the right spectacle lens of the spectacles arrangedin the measurement position, and wherein the optical axis of the cameraoptical unit of the first camera includes a stereo angle α′ with theoptical axis of the camera optical unit of the third camera and whereinthe second camera, with the optical axis of the camera optical unitrespectively includes a stereo angle β with the optical axes of thecamera optical units.
 9. A system for checking individual data of glazedspectacles comprising: the apparatus as claimed in claim 1, and at leastone of: a device for ascertaining a UV absorption behavior of the atleast one of the left spectacle lens and the right spectacle lens of thespectacles, a device for evaluating the arrangement of the at least oneof the left spectacle lens and the right spectacle of the spectacles,the device for evaluating the arrangement being configured to take intoaccount a measured refractive power distribution in a coordinate systemthat is fixed in relation to the spectacles, and a device for comparinga spatially resolved refractive power of the at least one of the leftspectacle lens and the right spectacle lens of the spectacles withintended values.
 10. A method for measuring individual data ofspectacles arranged in a stationary measurement position, the spectacleshaving at least one of a left spectacle lens with a left permanentmarking and a right spectacle lens with a right permanent marking, themethod comprising: capturing an image of a test structure with an imagecapture device while an imaging beam path passes through at least one ofthe left spectacle lens and the right spectacle lens of the spectaclesarranged in the measurement position, capturing a section of thespectacle frame of the spectacles with the image capture device, thesection defining a coordinate system of the spectacles, providingillumination light which passes through at least one of the leftspectacle lens and the right spectacle lens of the spectacles arrangedin the measurement position and which is thereafter at least partlyreflected back through the at least one of the left spectacle lens andthe right spectacle lens, capturing the left and right permanentmarkings respectively defining the local, body-inherent coordinatesystem for the at least one of the left spectacle lens and the rightspectacle lens with the image capture device, determining the coordinatesystem of the spectacles from the section of the spectacle frame,captured by the image capture device, of the spectacles arranged in themeasurement position, determining the respective local, body-inherentcoordinate system for at least one of the left spectacle lens and theright spectacle lens from the captured left and right permanent markingsof at least one of the left spectacle lens and the right spectacle lens,referencing the respective local, body-inherent coordinate system for atleast one of the left spectacle lens and the right spectacle lens to thecoordinate system of the spectacles; and determining a refractive powerdistribution for at least one section of the left spectacle lens in acoordinate system that is referenced to the coordinate system of thespectacles and to the local, body-inherent coordinate system for theleft spectacle lens and/or determining a refractive power distributionfor at least one section of the right spectacle lens in a coordinatesystem that is referenced to the coordinate system of the spectacles andto the local, body-inherent coordinate system for the right spectaclelens, from the coordinates of the test structure and the captured imageof the test structure, wherein the image capture device is configured tocapture the test structure with an imaging beam path that passes throughat least one of the left spectacle lens and the right spectacle lens ofthe spectacles arranged in the measurement position; and is configuredto capture a section of the spectacle frame of the spectacles arrangedin the measurement position, the section defining a coordinate system ofthe spectacles; and is configured to capture the left and rightpermanent markings, respectively, defining a local, body-inherentcoordinate system for the at least one of the left spectacle lens andthe right spectacle lens, wherein the test structure is displayed on adisplay, wherein the illumination light is provided by an illuminationdevice, wherein an adjustable reflector is provided which, in a firstsetting, reflects the illumination light having passed through the atleast one of the left spectacle lens and the right spectacle lens of thespectacles arranged in the measurement position at least partly backthrough the at least one of the left spectacle lens and the rightspectacle lens and which, in a second setting that differs from thefirst setting, uncovers the imaging beam path for capturing the teststructure displayed on the display with the image capture device, andwherein a computer unit is provided, the computer unit having a computerprogram for determining the coordinate system of the spectacles from thesection, captured by the image capture device, of the spectacle frame ofthe spectacles arranged in the measurement position, which, from thecaptured left and right permanent markings of at least one of the leftspectacle lens and the right spectacle lens respectively determines thelocal, body-inherent coordinate system for the left spectacle lens andright spectacle lens and references this to the coordinate system of thespectacles, and which, from the image of the test structure captured bythe image capture device and a known spatial orientation of the displayrelative to the image capture device, determines at least one of arefractive power distribution for at least a section of the leftspectacle lens, the refractive power distribution being determined in acoordinate system that is referenced to the coordinate system of thespectacles and to the local, body-inherent coordinate system for theleft spectacle lens, and a refractive power distribution for at least asection of the right spectacle lens, the refractive power distributionbeing determined in a coordinate system that is referenced to thecoordinate system of the spectacles and to the local, body-inherentcoordinate system for the right spectacle lens.
 11. A computer programproduct having a computer program with program code for carrying out themethod as claimed in claim 10 when the computer program is executed in acomputer unit.